shellDBus: Remove ShowMonitorLabels API

This API has been broken for quite some time now as the corresponding
mutter function meta_monitor_manager_get_monitor_for_output was removed.
If anyone tries to use it, we would just run into a backtrace.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/490

data/dbus-interfaces/org.gnome.Shell.xml

@@ -9,9 +9,6 @@
     <method name="ShowOSD">
       <arg type="a{sv}" direction="in" name="params"/>
     </method>
-    <method name="ShowMonitorLabels">
-      <arg type="a{uv}" direction="in" name="params"/>
-    </method>
     <method name="ShowMonitorLabels2">
       <arg type="a{sv}" direction="in" name="params"/>
     </method>

js/ui/osdMonitorLabeler.js

@@ -95,28 +95,6 @@ var OsdMonitorLabeler = class {
 
         this._reset();
 
-        for (let id in params) {
-            let monitor = this._monitorManager.get_monitor_for_output(id);
-            if (monitor == -1)
-                continue;
-            this._monitorLabels.get(monitor).push(params[id].deep_unpack());
-        }
-
-        // In mirrored display setups, more than one physical outputs
-        // might be showing the same logical monitor. In that case, we
-        // join each output's labels on the same OSD widget.
-        for (let [monitor, labels] of this._monitorLabels.entries()) {
-            labels.sort();
-            this._osdLabels.push(new OsdMonitorLabel(monitor, labels.join(' ')));
-        }
-    }
-
-    show2(client, params) {
-        if (!this._trackClient(client))
-            return;
-
-        this._reset();
-
         for (let connector in params) {
             let monitor = this._monitorManager.get_monitor_for_connector(connector);
             if (monitor == -1)

js/ui/shellDBus.js

@@ -203,16 +203,10 @@ var GnomeShell = class {
         this._grabbers.delete(name);
     }
 
-    ShowMonitorLabelsAsync(params, invocation) {
-        let sender = invocation.get_sender();
-        let [dict] = params;
-        Main.osdMonitorLabeler.show(sender, dict);
-    }
-
     ShowMonitorLabels2Async(params, invocation) {
         let sender = invocation.get_sender();
         let [dict] = params;
-        Main.osdMonitorLabeler.show2(sender, dict);
+        Main.osdMonitorLabeler.show(sender, dict);
     }
 
     HideMonitorLabelsAsync(params, invocation) {